[erlang-questions] Any canonical bandwidth benchmarks for clusters?
Wed Dec 3 04:02:30 CET 2008
First of all you would always expect IP over IB to be significantly
slower than the MPI/IB interface, because the later uses RDMA and
bypasses the OS's TCP/IP stack. I my experience with IP/IB, sending
large messages degrades throughput quite noticeably. Try to split
messages in smaller chunks and redo the benchmark for different message
Allen McPherson wrote:
> I'm testing some code that is showing terrible bandwidth
> on our 40+ node Infiniband cluster (7 MB/sec for a ring benchmark!).
> This code is using the IP over IB interface and send big (1+ MB)
> messages around (binaries and non-binaries). MPI code runs
> at good rates on this cluster.
> Before I post my code I thought I'd see if there were
> existing bandwidth benchmarks for distributed Erlang
> on a locally connected cluster. Haven't been able to
> find any via Google. Does anyone know of, or have, code
> that I might use to test.
> Lacking other tests I'll put together a longer post with
> my code included and maybe someone else with a similar
> cluster could run it?
> Allen McPherson
> Los Alamos National Laboratory
> erlang-questions mailing list
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